@media screen and (min-width: 600px) {
    main {
        display: grid;
        grid-template-columns: 21em 22em 21em;
        grid-template-rows: 10em 10em 10em;
        justify-items: center;
    }

    header > p {
        margin-bottom: 0em;
        margin-right: 10em;
        margin-left: 10em;
    }

    div.supervisor {
        width: 19em;
        height: 12.5em;
        grid-row: 2 / 2;
        grid-column: 1 / 1;
        margin-left: 2em;
    }

    div.team {
        width: 19em;
        height: 12.5em;
        grid-row: 1;
        grid-column: 2;
        margin-top: 3em;
    }
    div.karma {
        width: 19em;
        height: 12.5em;
        grid-row: 3 / 3;
        grid-column: 2 / 2;
        margin-top: -3em;
    }
    div.calculator {
        width: 19em;
        height: 12.5em;
        grid-row: 2;
        grid-column: 3;
    }

    .attribution {
        margin-left: -.5em;
        grid-row: 4;
        grid-column: 2;
        margin-top: 0em;
        margin-bottom: 0em;
    }
    
}

@media screen and (min-width: 992px) {
    header {
        margin-top: -3em;
    }
    header > h1 {
        font-size: 2em;
    }

    header > p {
        font-size: 1em;
    }

    main {
        margin-top: -3em;
    }

    div.supervisor, div.team, div.karma, div.calculator {
        height: 11em;
    }

    div.team {
        margin-top: 4em;
    }
}